BigInt.asIntN() - JavaScript 编辑

BigInt.asIntN 静态方法将 BigInt 值转换为一个 -2width-1 与 2width-1-1 之间的有符号整数。

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

语法

BigInt.asIntN(width, bigint);

参数

width

可存储整数的位数。

bigint

要存储在指定位数上的整数。

返回值

bigint 模(modulo) 2^width 作为有符号整数的值。

例子

保持在64位范围内

BigInt.asIntN() 方法对于保持在64位(64-bit)算数范围内非常有用。

const max = 2n ** (64n - 1n) - 1n;

BigInt.asIntN(64, max);
// ↪ 9223372036854775807n

BigInt.asIntN(64, max + 1n);
// ↪ -9223372036854775808n
// negative because of overflow

标准

Specification	Status
ECMAScript (ECMA-262) BigInt.asIntN()	Living Standard

浏览器支持

BCD tables only load in the browser

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

请参阅

• BigInt
• BigInt.asUintN()